Difference between revisions of "Build SQLite extension on windows"

From GRASS-Wiki
Jump to: navigation, search
Line 10: Line 10:
 
* Download the SQLite source from [https://www.sqlite.org/download.html here], unzip the archive and copy '''sqlite3.h''' and '''sqlite3ext.h''' in the folder of the step before (e.g. ''C:\OSGeo4Wdev\src\sqliteextension'')
 
* Download the SQLite source from [https://www.sqlite.org/download.html here], unzip the archive and copy '''sqlite3.h''' and '''sqlite3ext.h''' in the folder of the step before (e.g. ''C:\OSGeo4Wdev\src\sqliteextension'')
 
* Open the '''MSYS Shell''' offered by your OSGeo4W build environment and change to the SQLite extension directory by e.g. ''cd "C:\OSGeo4Wdev\src\sqliteextension"'' (double quotes are needed in the MSYS Shell)
 
* Open the '''MSYS Shell''' offered by your OSGeo4W build environment and change to the SQLite extension directory by e.g. ''cd "C:\OSGeo4Wdev\src\sqliteextension"'' (double quotes are needed in the MSYS Shell)
* Then type in the MSYS Shell following command: '''gcc -fPIC -lm -shared extension-functions.c -o libsqlitefunctions.dll'''  
+
* Then type in the MSYS Shell following command: '''gcc -fPIC -lm -shared extension-functions.c -o libsqlitefunctions.dll'''
 +
 
 +
Then '''libsqlitefunctions.dll''' is built and can be used by v.db.update (example from the manual):
 +
 
 +
    g.copy vect=precip_30ynormals,myprecip_30ynormals
 +
    v.db.addcolumn myprecip_30ynormals column="logjuly double precision"
 +
    v.db.update myprecip_30ynormals column="logjuly" query_column="log(jul)" \
 +
      sqliteextra=C:\OSGeo4Wdev\src\sqliteextension\libsqlitefunctions.dll
  
 
[[Category:FAQ]]
 
[[Category:FAQ]]

Revision as of 07:30, 28 December 2014

In v.db.update there is following option:

   sqliteextra=name
   Name of SQLite extension file for extra functions (SQLite backend only)

For build SQLite extension for winGRASS follow these steps:

  • Install the OSGeo4W directory structure as a build environment by these instructions
  • Download extension-functions.c from here and save the file in a folder of your OSGeo4W build environment (e.g. C:\OSGeo4Wdev\src\sqliteextension)
  • Download the SQLite source from here, unzip the archive and copy sqlite3.h and sqlite3ext.h in the folder of the step before (e.g. C:\OSGeo4Wdev\src\sqliteextension)
  • Open the MSYS Shell offered by your OSGeo4W build environment and change to the SQLite extension directory by e.g. cd "C:\OSGeo4Wdev\src\sqliteextension" (double quotes are needed in the MSYS Shell)
  • Then type in the MSYS Shell following command: gcc -fPIC -lm -shared extension-functions.c -o libsqlitefunctions.dll

Then libsqlitefunctions.dll is built and can be used by v.db.update (example from the manual):

   g.copy vect=precip_30ynormals,myprecip_30ynormals
   v.db.addcolumn myprecip_30ynormals column="logjuly double precision"
   v.db.update myprecip_30ynormals column="logjuly" query_column="log(jul)" \
     sqliteextra=C:\OSGeo4Wdev\src\sqliteextension\libsqlitefunctions.dll